The report, released by advocacy coalition Transportation for America, has a searchable map of all the bridge rankings in the U.S. The report rankings come from federal highway data.

Nationally, 11 percent of bridges are considered substanderd and Michigan ranks 18th among other states.

The term "structurally deficient" does not mean the bridge is unsafe, but that it will require rehabilitation or replacement.

"If we have any bridges we think are unsafe, we’ll close them," said Jeff Cranson, Director of Communications for the Michigan Department of Transportation

According to the report, most bridges are designed to last 50 years before a major overhaul or replacement is needed. Michigan bridges are, on average, 43 years old, the same as the national average. However but the average age of the Michigan’s structurally deficient bridges is 64.

The bridges included in the report are maintained by the state, counties and cities.

The report comes as Gov. Rick Snyder has urged the state legislature to find more funding to repair roads and other infrastructure, including bridges.

During his State of the State address in January, Snyder proposed to raise $1.2 billion a year in new revenue to fund road and infrastructure repairs. The legislature has debated increasing the gas tax and registration fees for electric and hybrid cars. It is unlikely, however, that they will take any action before summer recess.

"While the state's bridges are safe, without additional funding, it will become increasingly difficult for the state and local communities to maintain roads and bridges," said Cranson. "Michigan has not seen an increase in transportation funding since 1997 and the needs grow more critical by the day."

John LaMacchia, Michigan Municipal League, said he hopes the report shouldn't incite fear in people, but shows there is a need for more road funding.

"This is an issue that's not going to get better with our current state of funding," said LaMacchia.